[catacomb] / symm / latinpoly-def.h

/* -*-c-*-
 *
 * AEAD schemes based on Salsa20/ChaCha and Poly1305
 *
 * (c) 2018 Straylight/Edgeware
 */

/*----- Licensing notice --------------------------------------------------*
 *
 * This file is part of Catacomb.
 *
 * Catacomb is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Library General Public License as published
 * by the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * Catacomb is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with Catacomb.  If not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
 * USA.
 */

#ifndef CATACOMB_LATINPOLY_DEF_H
#define CATACOMB_LATINPOLY_DEF_H

#ifdef __cplusplus
  extern "C" {
#endif

/*----- Header files ------------------------------------------------------*/

#include <mLib/bits.h>
#include <mLib/buf.h>
#include <mLib/sub.h>

#ifndef CATACOMB_ARENA_H
#  include "arena.h"
#endif

#ifndef CATACOMB_CT_H
#  include "ct.h"
#endif

#ifndef CATACOMB_GAEAD_H
#  include "gaead.h"
#endif

#ifndef CATACOMB_KEYSZ_H
#  include "keysz.h"
#endif

#ifndef CATACOMB_LATINPOLY_H
#  include "latinpoly.h"
#endif

#ifndef CATACOMB_PARANOIA_H
#  include "paranoia.h"
#endif

#ifndef CATACOMB_POLY1305_H
#  include "poly1305.h"
#endif

#ifndef CATACOMB_SALSA20_H
#  include "salsa20.h"
#endif

/*----- Data structures ---------------------------------------------------*/

typedef struct latinpoly_aad {
  gaead_aad a;
  poly1305_ctx poly;
} latinpoly_aad;

typedef struct latinpoly_key {
  gaead_key k;
  octet key[SALSA20_KEYSZ];
  size_t ksz;
} latinpoly_key;

/*----- Common definitions ------------------------------------------------*/

/* Tables. */
extern const octet latinpoly_noncesz[], latinpoly_tagsz[];

/* AAD methods. */
extern void latinpoly_aadhash_poly1305(gaead_aad */*a*/,
				       const void */*h*/, size_t /*hsz*/);
extern void latinpoly_aaddestroy(gaead_aad */*a*/);

/* Variants. */
enum { LPVAR_POLY1305 };

/* --- @latinpoly_tag@ --- *
 *
 * Arguments:	@const poly1305_ctx *aad@ = Poly1305 context hashing AAD
 *		@poly1305_ctx *ct@ = Poly1305 context hashing ciphertext
 *		@void *tag@ = where to write the tag
 *
 * Returns:	---
 *
 * Use:		Completes a Latin-dance-Poly1305 tag, combining the AAD and
 *		ciphertext hashes, appending their lengths, and writing the
 *		final masked hash to @tag@.  The @ct@ context is clobbered.
 */

extern void latinpoly_tag(const poly1305_ctx */*aad*/,
			  poly1305_ctx */*ct*/, void */*tag*/);

/*----- Macros ------------------------------------------------------------*/

#define LATINPOLY_DEF(latin, base, name)				\
									\
/* Utilities. */							\
									\
/* Reinitialize the stream cipher and hash state given a new nonce. */	\
static int reinit_##latin(x##latin##_ctx *ctx,	int var,		\
			  poly1305_ctx *aadpoly, poly1305_ctx *ctpoly,	\
			  const void *n, size_t nsz)			\
{									\
  poly1305_key pk;							\
  octet b[POLY1305_KEYSZ + POLY1305_MASKSZ];				\
									\
  switch (nsz) {							\
    case SALSA20_NONCESZ:						\
      memcpy(ctx->s.a, ctx->k, sizeof(ctx->k));				\
      base##_setnonce(&ctx->s, n);					\
      break;								\
    case SALSA20_IETF_NONCESZ:						\
      memcpy(ctx->s.a, ctx->k, sizeof(ctx->k));				\
      base##_setnonce_ietf(&ctx->s, n);					\
      break;								\
    case XSALSA20_NONCESZ:						\
      x##latin##_setnonce(ctx, n);					\
      break;								\
    default:								\
      return (-1);							\
  }									\
									\
  latin##_encrypt(&ctx->s, 0, b, sizeof(b));				\
  poly1305_keyinit(&pk, b, POLY1305_KEYSZ);				\
  poly1305_macinit(ctpoly, &pk, b + POLY1305_KEYSZ);			\
  switch (var) {							\
    case LPVAR_POLY1305:						\
      poly1305_macinit(aadpoly, &pk, b + POLY1305_KEYSZ);		\
      latin##_encrypt(&ctx->s, 0, 0, SALSA20_OUTSZ - sizeof(b));	\
      break;								\
    default:								\
      assert(0);							\
  }									\
  return (0);								\
}									\
									\
/* AAD operations. */							\
									\
static const gaead_aadops gaops_##latin##_poly1305 =			\
  { &latin##_poly1305, 0, latinpoly_aadhash_poly1305, latinpoly_aaddestroy }; \
									\
									\
/* Encryption operations. */						\
									\
typedef struct gectx_##latin {						\
  gaead_enc e;								\
  latinpoly_aad aad;							\
  x##latin##_ctx ctx;							\
  poly1305_ctx poly;							\
} gectx_##latin;							\
									\
static gaead_aad *geaad_##latin(gaead_enc *e)				\
  { gectx_##latin *enc = (gectx_##latin *)e; return (&enc->aad.a); }	\
									\
static int gereinit_##latin##_poly1305(gaead_enc *e,			\
				       const void *n, size_t nsz,	\
				       size_t hsz, size_t msz, size_t tsz) \
{									\
  gectx_##latin *enc = (gectx_##latin *)e;				\
  return (reinit_##latin(&enc->ctx, LPVAR_POLY1305,			\
			 &enc->aad.poly, &enc->poly, n, nsz));		\
}									\
									\
static int geenc_##latin(gaead_enc *e,					\
			 const void *m, size_t msz, buf *b)		\
{									\
  gectx_##latin *enc = (gectx_##latin *)e;				\
  void *q;								\
									\
  if (msz) { q = buf_get(b, msz); if (!q) return (-1); }		\
  else q = 0;								\
  latin##_encrypt(&enc->ctx.s, m, q, msz);				\
  poly1305_hash(&enc->poly, q, msz);					\
  return (0);								\
}									\
									\
static int gedone_##latin##_common(gectx_##latin *enc,			\
				   const latinpoly_aad *aad,		\
				   buf *b, size_t tsz)			\
{									\
  if (tsz != POLY1305_TAGSZ) return (-1);				\
  assert((!enc->aad.poly.count && !enc->aad.poly.nbuf && !aad) ||	\
	 aad == &enc->aad);						\
  if (!BOK(b)) return (-1);						\
  return (0);								\
}									\
									\
static int gedone_##latin##_poly1305(gaead_enc *e, const gaead_aad *a,	\
				     buf *b, void *t, size_t tsz)	\
{									\
  gectx_##latin *enc = (gectx_##latin *)e;				\
  const latinpoly_aad *aad = (const latinpoly_aad *)a;			\
									\
  if (gedone_##latin##_common(enc, aad, b, tsz)) return (-1);		\
  latinpoly_tag(aad ? &aad->poly : 0, &enc->poly, t);			\
  return (0);								\
}									\
									\
static void gedestroy_##latin(gaead_enc *e)				\
  { gectx_##latin *enc = (gectx_##latin *)e; BURN(*enc); S_DESTROY(enc); } \
									\
static gaead_encops geops_##latin##_poly1305 =				\
  { &latin##_poly1305, geaad_##latin, gereinit_##latin##_poly1305,	\
    geenc_##latin, gedone_##latin##_poly1305, gedestroy_##latin };	\
									\
/* Decryption operations. */						\
									\
typedef struct gdctx_##latin {						\
  gaead_dec d;								\
  latinpoly_aad aad;							\
  x##latin##_ctx ctx;							\
  poly1305_ctx poly;							\
} gdctx_##latin;							\
									\
static gaead_aad *gdaad_##latin(gaead_dec *d)				\
  { gdctx_##latin *dec = (gdctx_##latin *)d; return (&dec->aad.a); }	\
									\
static int gdreinit_##latin##_poly1305(gaead_dec *d,			\
				       const void *n, size_t nsz,	\
				       size_t hsz, size_t msz, size_t tsz) \
{									\
  gdctx_##latin *dec = (gdctx_##latin *)d;				\
  return (reinit_##latin(&dec->ctx, LPVAR_POLY1305,			\
			 &dec->aad.poly, &dec->poly, n, nsz));		\
}									\
									\
static int gddec_##latin(gaead_dec *d,					\
			 const void *c, size_t csz, buf *b)		\
{									\
  gdctx_##latin *dec = (gdctx_##latin *)d;				\
  void *q;								\
									\
  if (csz) { q = buf_get(b, csz); if (!q) return (-1); }		\
  else q = 0;								\
  poly1305_hash(&dec->poly, c, csz);					\
  latin##_encrypt(&dec->ctx.s, c, q, csz);				\
  return (0);								\
}									\
									\
static int gddone_##latin##_common(gdctx_##latin *dec,			\
				   const latinpoly_aad *aad,		\
				   buf *b, size_t tsz)			\
{									\
  if (tsz != POLY1305_TAGSZ) return (-1);				\
  assert((!dec->aad.poly.count && !dec->aad.poly.nbuf && !aad) ||	\
	 aad == &dec->aad);						\
  if (!BOK(b)) return (-1);						\
  return (0);								\
}									\
									\
static int gddone_##latin##_poly1305(gaead_dec *d, const gaead_aad *a,	\
				     buf *b, const void *t, size_t tsz)	\
{									\
  gdctx_##latin *dec = (gdctx_##latin *)d;				\
  const latinpoly_aad *aad = (const latinpoly_aad *)a;			\
  octet u[POLY1305_TAGSZ];						\
									\
  if (gddone_##latin##_common(dec, aad, b, tsz)) return (-1);		\
  latinpoly_tag(aad ? &aad->poly : 0, &dec->poly, u);			\
  if (ct_memeq(t, u, POLY1305_TAGSZ)) return (+1);			\
  else return (0);							\
}									\
									\
static void gddestroy_##latin(gaead_dec *d)				\
  { gdctx_##latin *dec = (gdctx_##latin *)d; BURN(*dec); S_DESTROY(dec); } \
									\
static gaead_decops gdops_##latin##_poly1305 =				\
  { &latin##_poly1305, gdaad_##latin, gdreinit_##latin##_poly1305,	\
    gddec_##latin, gddone_##latin##_poly1305, gddestroy_##latin };	\
									\
/* Key operations. */							\
									\
static gaead_enc *gkenc_##latin##_poly1305(const gaead_key *k,		\
					   const void *n, size_t nsz,	\
					   size_t hsz, size_t msz,	\
					   size_t tsz)			\
{									\
  latinpoly_key *key = (latinpoly_key *)k;				\
  gectx_##latin *enc = S_CREATE(gectx_##latin);				\
									\
  enc->e.ops = &geops_##latin##_poly1305;				\
  enc->aad.a.ops = &gaops_##latin##_poly1305;				\
  x##latin##_init(&enc->ctx, key->key, key->ksz, 0);			\
  if (reinit_##latin(&enc->ctx, LPVAR_POLY1305,				\
		     &enc->aad.poly, &enc->poly, n, nsz))		\
    { gedestroy_##latin(&enc->e); return (0); }				\
  return (&enc->e);							\
}									\
									\
static gaead_dec *gkdec_##latin##_poly1305(const gaead_key *k,		\
					   const void *n, size_t nsz,	\
					   size_t hsz, size_t msz,	\
					   size_t tsz)			\
{									\
  latinpoly_key *key = (latinpoly_key *)k;				\
  gdctx_##latin *dec = S_CREATE(gdctx_##latin);				\
									\
  dec->d.ops = &gdops_##latin##_poly1305;				\
  dec->aad.a.ops = &gaops_##latin##_poly1305;				\
  x##latin##_init(&dec->ctx, key->key, key->ksz, 0);			\
  if (reinit_##latin(&dec->ctx, LPVAR_POLY1305,				\
		     &dec->aad.poly, &dec->poly, n, nsz))		\
    { gddestroy_##latin(&dec->d); return (0); }				\
  return (&dec->d);							\
}									\
									\
static void gkdestroy_##latin(gaead_key *k)				\
  { latinpoly_key *key = (latinpoly_key *)k; BURN(*key); S_DESTROY(key); } \
									\
static const gaead_keyops gkops_##latin##_poly1305 =			\
  { &latin##_poly1305, 0,						\
    gkenc_##latin##_poly1305, gkdec_##latin##_poly1305,			\
    gkdestroy_##latin };						\
									\
/* Class definition. */							\
									\
static gaead_key *gkey_##latin##_common(const gaead_keyops *ops,	\
					const void *k, size_t ksz)	\
{									\
  latinpoly_key *key = S_CREATE(latinpoly_key);				\
									\
  key->k.ops = ops;							\
  KSZ_ASSERT(latin, ksz); memcpy(key->key, k, ksz); key->ksz = ksz;	\
  return (&key->k);							\
}									\
									\
static gaead_key *gkey_##latin##_poly1305(const void *k, size_t ksz)	\
  { return (gkey_##latin##_common(&gkops_##latin##_poly1305, k, ksz)); } \
									\
const gcaead latin##_poly1305 = {					\
  name "-poly1305", latin##_keysz, latinpoly_noncesz, latinpoly_tagsz,	\
  64, 0, 0, AEADF_AADNDEP,						\
  gkey_##latin##_poly1305						\
};

/*----- That's all, folks -------------------------------------------------*/

#ifdef __cplusplus
  }
#endif

#endif
Commit	Line	Data
aac19f0d MW	1	/* --c--
	2	*
	3	* AEAD schemes based on Salsa20/ChaCha and Poly1305
	4	*
	5	* (c) 2018 Straylight/Edgeware
	6	*/
	7
	8	/----- Licensing notice --------------------------------------------------
	9	*
	10	* This file is part of Catacomb.
	11	*
	12	* Catacomb is free software: you can redistribute it and/or modify it
	13	* under the terms of the GNU Library General Public License as published
	14	* by the Free Software Foundation; either version 2 of the License, or
	15	* (at your option) any later version.
	16	*
	17	* Catacomb is distributed in the hope that it will be useful, but
	18	* WITHOUT ANY WARRANTY; without even the implied warranty of
	19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	20	* Library General Public License for more details.
	21	*
	22	* You should have received a copy of the GNU Library General Public
	23	* License along with Catacomb. If not, write to the Free Software
	24	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
	25	* USA.
	26	*/
	27
	28	#ifndef CATACOMB_LATINPOLY_DEF_H
	29	#define CATACOMB_LATINPOLY_DEF_H
	30
	31	#ifdef __cplusplus
	32	extern "C" {
	33	#endif
	34
	35	/----- Header files ------------------------------------------------------/
	36
	37	#include <mLib/bits.h>
	38	#include <mLib/buf.h>
	39	#include <mLib/sub.h>
	40
	41	#ifndef CATACOMB_ARENA_H
	42	# include "arena.h"
	43	#endif
	44
	45	#ifndef CATACOMB_CT_H
	46	# include "ct.h"
	47	#endif
	48
	49	#ifndef CATACOMB_GAEAD_H
	50	# include "gaead.h"
	51	#endif
	52
	53	#ifndef CATACOMB_KEYSZ_H
	54	# include "keysz.h"
	55	#endif
	56
	57	#ifndef CATACOMB_LATINPOLY_H
	58	# include "latinpoly.h"
	59	#endif
	60
	61	#ifndef CATACOMB_PARANOIA_H
	62	# include "paranoia.h"
	63	#endif
	64
65	#ifndef CATACOMB_POLY1305_H
66	# include "poly1305.h"
67	#endif
68
69	#ifndef CATACOMB_SALSA20_H
70	# include "salsa20.h"
71	#endif
72
73	/----- Data structures ---------------------------------------------------/
74
75	typedef struct latinpoly_aad {
76	gaead_aad a;
77	poly1305_ctx poly;
78	} latinpoly_aad;
79
80	typedef struct latinpoly_key {
81	gaead_key k;
82	octet key[SALSA20_KEYSZ];
83	size_t ksz;
84	} latinpoly_key;
85
86	/----- Common definitions ------------------------------------------------/
87
88	/* Tables. */
89	extern const octet latinpoly_noncesz[], latinpoly_tagsz[];
90
91	/* AAD methods. */
0cf9e22f MW	92	extern void latinpoly_aadhash_poly1305(gaead_aad /a*/,
0cf9e22f MW	93	const void /h/, size_t /hsz*/);
aac19f0d MW	94	extern void latinpoly_aaddestroy(gaead_aad /a*/);
aac19f0d MW	95
0cf9e22f MW	96	/* Variants. */
	97	enum { LPVAR_POLY1305 };
	98
aac19f0d MW	99	/* --- @latinpoly_tag@ --- *
	100	*
	101	* Arguments: @const poly1305_ctx *aad@ = Poly1305 context hashing AAD
	102	* @poly1305_ctx *ct@ = Poly1305 context hashing ciphertext
	103	* @void *tag@ = where to write the tag
	104	*
	105	* Returns: ---
	106	*
	107	* Use: Completes a Latin-dance-Poly1305 tag, combining the AAD and
	108	* ciphertext hashes, appending their lengths, and writing the
	109	* final masked hash to @tag@. The @ct@ context is clobbered.
	110	*/
	111
	112	extern void latinpoly_tag(const poly1305_ctx /aad*/,
	113	poly1305_ctx /ct/, void /tag/);
	114
	115	/----- Macros ------------------------------------------------------------/
	116
	117	#define LATINPOLY_DEF(latin, base, name) \
	118	\
	119	/* Utilities. */ \
	120	\
	121	/* Reinitialize the stream cipher and hash state given a new nonce. */ \
0cf9e22f	122	static int reinit_##latin(x##latin##_ctx *ctx, int var, \
aac19f0d MW	123	poly1305_ctx aadpoly, poly1305_ctx ctpoly, \
	124	const void *n, size_t nsz) \
	125	{ \
	126	poly1305_key pk; \
	127	octet b[POLY1305_KEYSZ + POLY1305_MASKSZ]; \
	128	\
	129	switch (nsz) { \
	130	case SALSA20_NONCESZ: \
	131	memcpy(ctx->s.a, ctx->k, sizeof(ctx->k)); \
	132	base##_setnonce(&ctx->s, n); \
	133	break; \
	134	case SALSA20_IETF_NONCESZ: \
	135	memcpy(ctx->s.a, ctx->k, sizeof(ctx->k)); \
	136	base##_setnonce_ietf(&ctx->s, n); \
	137	break; \
	138	case XSALSA20_NONCESZ: \
	139	x##latin##_setnonce(ctx, n); \
	140	break; \
	141	default: \
	142	return (-1); \
	143	} \
	144	\
	145	latin##_encrypt(&ctx->s, 0, b, sizeof(b)); \
	146	poly1305_keyinit(&pk, b, POLY1305_KEYSZ); \
aac19f0d	147	poly1305_macinit(ctpoly, &pk, b + POLY1305_KEYSZ); \
0cf9e22f MW	148	switch (var) { \
	149	case LPVAR_POLY1305: \
	150	poly1305_macinit(aadpoly, &pk, b + POLY1305_KEYSZ); \
	151	latin##_encrypt(&ctx->s, 0, 0, SALSA20_OUTSZ - sizeof(b)); \
	152	break; \
	153	default: \
	154	assert(0); \
	155	} \
aac19f0d MW	156	return (0); \
	157	} \
	158	\
	159	/* AAD operations. */ \
	160	\
0cf9e22f MW	161	static const gaead_aadops gaops_##latin##_poly1305 = \
	162	{ &latin##_poly1305, 0, latinpoly_aadhash_poly1305, latinpoly_aaddestroy }; \
	163	\
aac19f0d MW	164	\
	165	/* Encryption operations. */ \
	166	\
	167	typedef struct gectx_##latin { \
	168	gaead_enc e; \
	169	latinpoly_aad aad; \
	170	x##latin##_ctx ctx; \
	171	poly1305_ctx poly; \
	172	} gectx_##latin; \
	173	\
	174	static gaead_aad geaad_##latin(gaead_enc e) \
	175	{ gectx_##latin enc = (gectx_##latin )e; return (&enc->aad.a); } \
	176	\
0cf9e22f MW	177	static int gereinit_##latin##_poly1305(gaead_enc *e, \
	178	const void *n, size_t nsz, \
	179	size_t hsz, size_t msz, size_t tsz) \
aac19f0d MW	180	{ \
aac19f0d MW	181	gectx_##latin enc = (gectx_##latin )e; \
0cf9e22f MW	182	return (reinit_##latin(&enc->ctx, LPVAR_POLY1305, \
0cf9e22f MW	183	&enc->aad.poly, &enc->poly, n, nsz)); \
aac19f0d MW	184	} \
	185	\
	186	static int geenc_##latin(gaead_enc *e, \
	187	const void m, size_t msz, buf b) \
	188	{ \
	189	gectx_##latin enc = (gectx_##latin )e; \
	190	void *q; \
	191	\
	192	if (msz) { q = buf_get(b, msz); if (!q) return (-1); } \
	193	else q = 0; \
	194	latin##_encrypt(&enc->ctx.s, m, q, msz); \
	195	poly1305_hash(&enc->poly, q, msz); \
	196	return (0); \
	197	} \
	198	\
0cf9e22f MW	199	static int gedone_##latin##_common(gectx_##latin *enc, \
	200	const latinpoly_aad *aad, \
	201	buf *b, size_t tsz) \
	202	{ \
	203	if (tsz != POLY1305_TAGSZ) return (-1); \
	204	assert((!enc->aad.poly.count && !enc->aad.poly.nbuf && !aad) \|\| \
	205	aad == &enc->aad); \
	206	if (!BOK(b)) return (-1); \
	207	return (0); \
	208	} \
	209	\
	210	static int gedone_##latin##_poly1305(gaead_enc e, const gaead_aad a, \
	211	buf b, void t, size_t tsz) \
aac19f0d MW	212	{ \
	213	gectx_##latin enc = (gectx_##latin )e; \
	214	const latinpoly_aad aad = (const latinpoly_aad )a; \
	215	\
0cf9e22f	216	if (gedone_##latin##_common(enc, aad, b, tsz)) return (-1); \
aac19f0d MW	217	latinpoly_tag(aad ? &aad->poly : 0, &enc->poly, t); \
	218	return (0); \
	219	} \
	220	\
	221	static void gedestroy_##latin(gaead_enc *e) \
	222	{ gectx_##latin enc = (gectx_##latin )e; BURN(*enc); S_DESTROY(enc); } \
	223	\
0cf9e22f MW	224	static gaead_encops geops_##latin##_poly1305 = \
	225	{ &latin##_poly1305, geaad_##latin, gereinit_##latin##_poly1305, \
	226	geenc_##latin, gedone_##latin##_poly1305, gedestroy_##latin }; \
aac19f0d MW	227	\
	228	/* Decryption operations. */ \
	229	\
	230	typedef struct gdctx_##latin { \
	231	gaead_dec d; \
	232	latinpoly_aad aad; \
	233	x##latin##_ctx ctx; \
	234	poly1305_ctx poly; \
	235	} gdctx_##latin; \
	236	\
	237	static gaead_aad gdaad_##latin(gaead_dec d) \
	238	{ gdctx_##latin dec = (gdctx_##latin )d; return (&dec->aad.a); } \
	239	\
0cf9e22f MW	240	static int gdreinit_##latin##_poly1305(gaead_dec *d, \
	241	const void *n, size_t nsz, \
	242	size_t hsz, size_t msz, size_t tsz) \
aac19f0d MW	243	{ \
aac19f0d MW	244	gdctx_##latin dec = (gdctx_##latin )d; \
0cf9e22f MW	245	return (reinit_##latin(&dec->ctx, LPVAR_POLY1305, \
0cf9e22f MW	246	&dec->aad.poly, &dec->poly, n, nsz)); \
aac19f0d MW	247	} \
	248	\
	249	static int gddec_##latin(gaead_dec *d, \
	250	const void c, size_t csz, buf b) \
	251	{ \
	252	gdctx_##latin dec = (gdctx_##latin )d; \
	253	void *q; \
	254	\
	255	if (csz) { q = buf_get(b, csz); if (!q) return (-1); } \
	256	else q = 0; \
	257	poly1305_hash(&dec->poly, c, csz); \
	258	latin##_encrypt(&dec->ctx.s, c, q, csz); \
	259	return (0); \
	260	} \
	261	\
0cf9e22f MW	262	static int gddone_##latin##_common(gdctx_##latin *dec, \
	263	const latinpoly_aad *aad, \
	264	buf *b, size_t tsz) \
	265	{ \
	266	if (tsz != POLY1305_TAGSZ) return (-1); \
	267	assert((!dec->aad.poly.count && !dec->aad.poly.nbuf && !aad) \|\| \
	268	aad == &dec->aad); \
	269	if (!BOK(b)) return (-1); \
	270	return (0); \
	271	} \
	272	\
	273	static int gddone_##latin##_poly1305(gaead_dec d, const gaead_aad a, \
	274	buf b, const void t, size_t tsz) \
aac19f0d MW	275	{ \
	276	gdctx_##latin dec = (gdctx_##latin )d; \
	277	const latinpoly_aad aad = (const latinpoly_aad )a; \
	278	octet u[POLY1305_TAGSZ]; \
	279	\
0cf9e22f	280	if (gddone_##latin##_common(dec, aad, b, tsz)) return (-1); \
aac19f0d MW	281	latinpoly_tag(aad ? &aad->poly : 0, &dec->poly, u); \
	282	if (ct_memeq(t, u, POLY1305_TAGSZ)) return (+1); \
	283	else return (0); \
	284	} \
	285	\
	286	static void gddestroy_##latin(gaead_dec *d) \
	287	{ gdctx_##latin dec = (gdctx_##latin )d; BURN(*dec); S_DESTROY(dec); } \
	288	\
0cf9e22f MW	289	static gaead_decops gdops_##latin##_poly1305 = \
	290	{ &latin##_poly1305, gdaad_##latin, gdreinit_##latin##_poly1305, \
	291	gddec_##latin, gddone_##latin##_poly1305, gddestroy_##latin }; \
aac19f0d MW	292	\
	293	/* Key operations. */ \
	294	\
0cf9e22f MW	295	static gaead_enc gkenc_##latin##_poly1305(const gaead_key k, \
	296	const void *n, size_t nsz, \
	297	size_t hsz, size_t msz, \
	298	size_t tsz) \
aac19f0d MW	299	{ \
	300	latinpoly_key key = (latinpoly_key )k; \
	301	gectx_##latin *enc = S_CREATE(gectx_##latin); \
	302	\
0cf9e22f MW	303	enc->e.ops = &geops_##latin##_poly1305; \
0cf9e22f MW	304	enc->aad.a.ops = &gaops_##latin##_poly1305; \
aac19f0d	305	x##latin##_init(&enc->ctx, key->key, key->ksz, 0); \
0cf9e22f MW	306	if (reinit_##latin(&enc->ctx, LPVAR_POLY1305, \
	307	&enc->aad.poly, &enc->poly, n, nsz)) \
	308	{ gedestroy_##latin(&enc->e); return (0); } \
aac19f0d MW	309	return (&enc->e); \
	310	} \
	311	\
0cf9e22f MW	312	static gaead_dec gkdec_##latin##_poly1305(const gaead_key k, \
	313	const void *n, size_t nsz, \
	314	size_t hsz, size_t msz, \
	315	size_t tsz) \
aac19f0d MW	316	{ \
	317	latinpoly_key key = (latinpoly_key )k; \
	318	gdctx_##latin *dec = S_CREATE(gdctx_##latin); \
	319	\
0cf9e22f MW	320	dec->d.ops = &gdops_##latin##_poly1305; \
0cf9e22f MW	321	dec->aad.a.ops = &gaops_##latin##_poly1305; \
aac19f0d	322	x##latin##_init(&dec->ctx, key->key, key->ksz, 0); \
0cf9e22f MW	323	if (reinit_##latin(&dec->ctx, LPVAR_POLY1305, \
	324	&dec->aad.poly, &dec->poly, n, nsz)) \
	325	{ gddestroy_##latin(&dec->d); return (0); } \
aac19f0d MW	326	return (&dec->d); \
	327	} \
	328	\
	329	static void gkdestroy_##latin(gaead_key *k) \
	330	{ latinpoly_key key = (latinpoly_key )k; BURN(*key); S_DESTROY(key); } \
	331	\
0cf9e22f MW	332	static const gaead_keyops gkops_##latin##_poly1305 = \
	333	{ &latin##_poly1305, 0, \
	334	gkenc_##latin##_poly1305, gkdec_##latin##_poly1305, \
aac19f0d MW	335	gkdestroy_##latin }; \
	336	\
	337	/* Class definition. */ \
	338	\
0cf9e22f MW	339	static gaead_key gkey_##latin##_common(const gaead_keyops ops, \
0cf9e22f MW	340	const void *k, size_t ksz) \
aac19f0d MW	341	{ \
	342	latinpoly_key *key = S_CREATE(latinpoly_key); \
	343	\
0cf9e22f	344	key->k.ops = ops; \
aac19f0d MW	345	KSZ_ASSERT(latin, ksz); memcpy(key->key, k, ksz); key->ksz = ksz; \
	346	return (&key->k); \
	347	} \
	348	\
0cf9e22f MW	349	static gaead_key gkey_##latin##_poly1305(const void k, size_t ksz) \
	350	{ return (gkey_##latin##_common(&gkops_##latin##_poly1305, k, ksz)); } \
	351	\
aac19f0d MW	352	const gcaead latin##_poly1305 = { \
	353	name "-poly1305", latin##_keysz, latinpoly_noncesz, latinpoly_tagsz, \
	354	64, 0, 0, AEADF_AADNDEP, \
0cf9e22f	355	gkey_##latin##_poly1305 \
aac19f0d MW	356	};
	357
	358	/----- That's all, folks -------------------------------------------------/
	359
	360	#ifdef __cplusplus
	361	}
	362	#endif
	363
	364	#endif